Every time I have tried to WILD (it's been three times just today) I listen to Shimmering Gossamer Binaural Beats, and I lay down in a comfortable position. I see light patterns and some stars, and SP kicks in. It only seems to really concentrate on my left leg, but that could be a different thing happening. (I do have occasional leg and knee problems) I never once have had HH/HI other than occasional crashing sounds in the background and a small sensation of floating. After this, my SP seems to suddenly fade and I wake up, thinking I might be having a false awakening.

What could be causing these SP problems, I wonder?